木屑炭水蒸气气化制备合成气

以木屑炭为原料,在上吸式固定床气化炉中进行水蒸气气化制备合成气,考察了温度和水蒸气流量对木屑炭水蒸气气化的产物分布、炭转化率、产气率、组成含量和H₂/CO值的影响。结果表明：升高温度有助于木屑炭气化,炭转化率和产气率分别在950 ℃下达到最大值99.2%和4.16 L/g,但温度升高会导致H₂从65.8%降至61.2%,同时H₂/CO也呈下降趋势,从10.3降至3.35;水蒸气流量的增加可提升H₂,从59.8%升至62%,但流量升至0.6 g/min时气化结果趋于稳定。水蒸气气化的最佳操作条件为900 ℃,水蒸气流量0.6 g/min,此条件下炭转化率、产气率和热值分别达到93.3%、4.06 L/g和9.04 MJ/m³,H₂/CO值为4.11,适合于合成甲烷。

Steam Gasification of Sawdust-char for Syngas

Steam gasification of sawdust-char was studied in updraft fixed bed reactor to prepare syngas. The effects of temperature and steam flow rate on products distribution, char conversion rate, gas yield, gas composition and the ratio of H₂/CO were investigated. The results showed that temperature had a positive effect on sawdust-char steam gasification, the maximum char conversion rate and gas yield of 99.2% and 4.16 L/g were obtained at 950 ℃. However, the increase of temperature would cause the decrease of H₂ concentration from 65.8% to 61.2%. In the meantime, the ratio of H₂/CO decreased from 10.3 to 3.35. Increasing steam flow rate could improve H₂ concentration from 59.8% to 62%, but there was no change in gasification consequences with the steam flow rate higher than 0.6 g/min. In addition, the temperature of 900 ℃and the steam flow rate of 0.6 g/min were the optimum operating conditions, and the char conversion rate of 93.3% and gas yield of 4.06 L/g could be obtained. Furthermore, the ratio of H₂/CO could arrive to 4.11, meeting the requirement of methanation.